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9. Oshkosh Corp. (OSK)

Contracted in 2011: $4.94 billion
Total 2011 revenue: $7.6 billion
Contracted in 2012, so far: $430 million
Company Profile

Oshkosh, headquartered in Oshkosh, Wisc., is primarily concerned with the design and manufacture of vehicles and vehicle bodies and has been a contractor of the U.S. Department of Defense for over 80 years, becoming its leading supplier of heavy and medium payload tactical trucks.

The Department of Defense is responsible for Oshkosh’s top 10 contracts from 2011, which ranged from $125 million to just over $900 million. The biggest contracts for Oshkosh in 2011 were for ground effect vehicles.A majority of the contracts, $4.93 billion, arose from the U.S. Army, according to USASpending.gov. However, compared to a year earlier, contracts won by Oshkosh have dropped significantly, from $7.2 billion in 2010 to $4.94 billion in 2011.

Pictured: US military personnel prepare to load Oshkosh armored vehicles onto a plane bound for Afghanistan at the the Manas Transit Center 30km from Bishkek.

Photo: Vyacheslav Oseledko | AFP | Getty Images